Acoustic generator, acoustic generation device, and electronic apparatus

Patent metadata

Field	Value
Publication number	US-2016337759-A1
Application number	US-201515110881-A
Country	US
Kind code	A1
Filing date	Jan 13, 2015
Priority date	Jan 11, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

There are provided an acoustic generator capable of generating a high-quality sound having little distortion, and an acoustic generation device and an electronic apparatus using the same. An acoustic generator has a vibration body, a first exciter, a second exciter, a first damping material and a second damping material. The vibration body has two surfaces which are positioned with a gap therebetween in a first direction. The first exciter and the second exciter are disposed on the vibration body. The first damping material is disposed on the vibration body and has a first portion which overlaps the first exciter when viewed in the first direction. The second damping material is disposed on the vibration body and has a second portion which overlaps the second exciter when viewed in the first direction.

First claim

1 . An acoustic generator, comprising:
a vibration body having two surfaces which are positioned with a gap therebetween in a first direction; a first exciter and a second exciter which are disposed on the vibration body; a first damping material disposed on the vibration body, the first damping material having a first portion which overlaps the first exciter when viewed in the first direction; and a second damping material disposed on the vibration body, the second damping material having a second portion which overlaps the second exciter when viewed in the first direction.

2 . The acoustic generator according to claim 1 ,
wherein an area of the first portion and an area of the second portion are different from each other.

3 . The acoustic generator according to claim 1 ,
wherein a shape of the first portion and a shape of the second portion are different from each other.

4 . The acoustic generator according to claim 1 ,
wherein the first exciter has a third portion which does not overlap the first damping material when viewed in the first direction, and the second exciter has a fourth portion which does not overlap the second damping material when viewed in the first direction.

5 . The acoustic generator according to claim 4 ,
wherein an area of the third portion and an area of the fourth portion are different from each other.

6 . The acoustic generator according to claim 4 ,
wherein a shape of the third portion and a shape of the fourth portion are different from each other.

7 . The acoustic generator according to claim 1 ,
wherein when one direction perpendicular to the first direction is described as a second direction, a midpoint of a segment connecting a center of gravity of the first exciter and a center of gravity of the second exciter is positioned closer to a second direction side than to a center of gravity of the vibration body when viewed in the first direction, and when a direction opposite to the second direction is described as a third direction, the first portion is in contact with an end portion in the third direction of the first exciter when viewed in the first direction and the second portion is in contact with an end portion in the third direction of the second exciter when viewed in the first direction.

8 . The acoustic generator according to claim 7 ,
Wherein, when viewed in the first direction, the center of gravity of the first exciter is positioned closer to a third direction side than to the center of gravity of the vibration body, and an end portion in the second direction of the first damping material is positioned closer to the second direction side than to an end portion in the second direction of the first exciter, and when viewed in the first direction, the center of gravity of the second exciter is positioned closer to the second direction side than to the center of gravity of the vibration body, and an end portion in the third direction of the second damping material is positioned closer to the third direction side than to an end portion in the third direction of the second exciter.

9 . The acoustic generator according to claim 1 ,
wherein the first damping material and the second damping material are integrated.

10 . The acoustic generator according to claim 1 , further comprising:
a resin layer which covers at least a portion of the vibration body, wherein the first damping material and the second damping material are attached to the vibration body via the resin layer.

11 . An acoustic generation device, comprising:
the acoustic generator according to claim 1 ; and an enclosure attached to the acoustic generator.

12 . An electronic apparatus, comprising:
the acoustic generator according to claim 1 ; and an electronic circuit connected to the acoustic generator.

Assignees

• Kyocera Corp

Inventors

• Kushima Noriyuki
• Miyazato Kentarou
• Takahashi Tooru
• Fukuoka Shuichi
• Yamakawa Kenji
• Murahashi Masato
• Ninomiya Hiroshi

Classifications

• H04R7/04

  Plane diaphragms · CPC title

• H04R7/26

  Damping by means acting directly on free portion of diaphragm or cone (air damping H04R1/28) · CPC title

• H04R7/18

  at the periphery · CPC title

• H04R17/005 Primary

  using a piezoelectric polymer · CPC title

• H04R17/00

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title